KR20240004753A - Low dielectric loss glass fiber compositions - Google Patents

Abstract

The present invention belongs to the field of glass fiber technology and specifically relates to low dielectric loss glass fiber compositions. The content of each component of the composition is SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18%, CaO: 1-6%, F ₂ : 0.2-1.50%. , SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%. The present invention not only makes glass fibers have a relatively low dielectric constant and dielectric loss by adding SnO ₂ and F ₂ at the same time and controlling the ratio of F ₂ /SnO ₂ , but also reduces the viscosity of the glass fibers to increase the number of bubbles in the glass fibers. Let it be 0. The interaction between the various components of the present invention allows the resulting glass fiber composition to have low dielectric constant, low dielectric loss, low foam, low viscosity and excellent glass performance.

Description

Low dielectric loss glass fiber compositions

The present invention belongs to the field of glass fiber technology and specifically relates to low dielectric loss glass fiber compositions.

With the development of 5G communications, the requirements for the performance of low-dielectric materials have become more stringent. The biggest advantage of 5G is its fast propagation speed, and its biggest disadvantages are low penetration power and large attenuation, and glass generates loss by converting some of the electrical energy into heat energy in high-frequency electromagnetic fields, which is the material of the propagation medium. It is required to have characteristics of low dielectric constant and low dielectric loss, which means that the faster the signal transmission, the lower the signal delay and the higher the signal fidelity.

In Chinese patent CN102503153A, SiO ₂ 48~58wt%, Al ₂ O ₃ 10~18wt%, B ₂ O ₃ 18wt%~28wt%, CaO 0~6wt%, MgO 0~6wt%, Y ₂ O ₃ 0.5~8wt% , CeO ₂ 0.2~0.6wt%, F ₂ 0~3wt%, Na ₂ O, K ₂ O and Li ₂ O 0~1wt%, TiO ₂ 0~0.45wt%, Fe ₂ O ₃ 0~0.5wt% A glass fiber with a low dielectric constant was disclosed, and the glass fiber has a dielectric constant of 4.1 to 4.5 and a dielectric loss of 6 × 10 ^-4 to 9 × 10 ^-4 when the frequency is 1 MHz at room temperature.

Chinese patent CN104556710A discloses a release glass fiber and a manufacturing method thereof, and the release glass fiber contains 52% to 58% of SiO ₂ , 16% to 24% of B ₂ O ₃ , and 13% to 13% of Al ₂ O ₃ when calculated in mole percentage. 19%, CaO 1%~5%, MgO 4.2%~8%, F ₂ 0.4%~2%, Li ₂ O 0~0.5%, Fe ₂ O ₃ 0~0.4%, K ₂ O 0~0.2%, Contains components such as Na ₂ 0 0~0.2%. The release glass fiber has a dielectric constant of less than 4.7 and a dielectric loss coefficient of less than 10 ^-3 when the frequency is 1 MHz at room temperature.

Chinese patent CN103482876A discloses low dielectric constant glass fibers for printed circuit boards, with mass percentages of SiO ₂ 48% to 53%, Al ₂ O ₃ 13% to 16%, B ₂ O ₃ 19% to 25%, P ₂ O ₅ 0.5%~2%, CaO 5.0%~8.5%, La ₂ O ₃ 0.5%~8%, ZnO 0.5%~2.5%, TiO ₂ 0.5%~2%, Na ₂ 0, K ₂ 0 and Li It contains components containing less than 1% of ₂ O, less than 0.45% of SO ₃ , and less than 0.45% of Fe ₂ O ₃ . It has a very low dielectric constant and dielectric loss. At room temperature and a frequency of 1MHz, the dielectric constant is 4.8~5.5 and the dielectric loss is 4~8×10 ^-4 .

In the above patent, the glass fiber has a relatively low viscosity, but its dielectric properties were detected under the condition of 1 MHz, so the dielectric loss of the glass increases as the frequency increases. For example, at 1 MHz at room temperature, tanδ of silicate glass is 9×10 ^-4 , and at 3000 MHz, it is 36×10 ^-4 . Therefore, the above patent has relatively low dielectric loss only when detected at room temperature and 1MHz conditions.

In Chinese patent CN113135666A, SiO ₂ : 50~58%, Al ₂ O ₃ : 10~16%, B ₂ O ₃ : 20~28%, MgO: 1~4%, CaO: 1~4%, Li ₂ O: 0.05~0.5%, Na ₂ O: 0.05~0.6%, K ₂ O: 0.05~0.8%, TiO ₂ : 0.2~1.5%, CeO ₂ : 0~1%, SnO ₂ : 0.01~1.5%, Fe ₂ O ₃ : 0~0.1% A low-dielectric glass fiber comprising By reasonably setting the ratio of silicon oxide, aluminum oxide, and boron oxide, the glass fiber was made to have a relatively low dielectric constant and dielectric loss, and the glass viscosity was appropriately adjusted. The glass fiber has a dielectric constant of 4.2 to 4.5 and a dielectric loss of 2.5 × 10 ^-3 to 4.4 × 10 ^-3 when the frequency is 10 GHz at room temperature. The dielectric constant and dielectric loss in this patent are relatively high.

Based on the above problems, there is an urgent need to develop glass fiber compositions with low dielectric constant, low dielectric loss, low viscosity, and zero bubbles suitable for large-scale production at high frequencies.

The present invention aims to provide a glass fiber composition with low dielectric constant, low dielectric loss, low viscosity, and zero bubbles.

The low dielectric loss glass fiber composition of the present invention has, based on mass percentage, the content of each component: SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18%, CaO: 1~6%, F ₂ : 0.2~1.50%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%.

Preferably, the low dielectric loss glass fiber composition has a content of each component, based on mass percentage, of SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18. %, CaO: 1~6%, F ₂ : 0.2~1.50%, P ₂ O ₅ : 0.05~5%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%.

Preferably, the low dielectric loss glass fiber composition has a content of each component, based on mass percentage, of SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18. %, CaO: 1~6%, F ₂ : 0.2~1.50%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%, 0<MgO<2.0 am.

Preferably, the low dielectric loss glass fiber composition has a content of each component, based on mass percentage, of SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18. %, CaO: 1~6%, F ₂ : 0.2~1.50%, P ₂ O ₅ : 0.05~5%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%, 0<MgO<2.0.

Here, the range in which the mass percentage content of SnO ₂ and Li ₂ O satisfies SnO ₂ /Li ₂ O is 0.2 to 3.

The range in which the mass percentage content of F ₂ and SnO ₂ satisfies F ₂ /SnO ₂ is 1 to 5.

The range in which the mass percentage content of P ₂ O ₅ , F ₂ and SnO ₂ satisfies P ₂ O ₅ /(F ₂ +SnO ₂ ) is 2 to 5.

The raw materials for producing the glass fiber composition of the present invention are quartz powder, boron anhydride, aluminum oxide, wollastonite, magnesium oxide, tin oxide, fluorite, aluminum metaphosphate, and lithiapyroxene, respectively.

The beneficial effects of the present invention are as follows.

SiO ₂ forms an irregular continuous network structure with the structure of a Si-O tetrahedron. This structure has high bonding strength, a dense structure, is difficult to polarize under the action of an external electric field, and is difficult to generate losses such as electrical conduction and relaxation. A high SiO ₂ content can significantly reduce the glass dielectric constant and dielectric loss and improve mechanical strength. However, as the content increases, the viscosity increases and melt manufacturing becomes difficult. For example, quartz glass has a very low dielectric loss of 0.0001, but its high viscosity makes it difficult to melt. The present invention limits the SiO ₂ content range to 50%-60%.

B ₂ O ₃ can lower the viscosity at high temperatures because boron exists as a triangle of boron and oxygen, but when the boron content reaches a certain value, the viscosity increases, which is disadvantageous for production, so the boron content should not be too high. And if the B ₂ O ₃ content is too high, the SiO ₂ grid easily precipitates and phase separation occurs. Additionally, the addition of B ₂ O ₃ introduces B ³⁺ to form BO, and the binding energy of this bond is greater than that of the Si-O bond, so it serves to stabilize the glass network structure within the glass and limit the polarization of oxygen ions. can cause Therefore, adding B ₂ O ₃ can reduce the dielectric constant and dielectric loss. The present invention limits the B ₂ O ₃ content range to 20% to 30%.

Addition of Al ₂ O ₃ can effectively suppress crystallization (bulkcrystallization) of glass. In multicomponent glass, Al ₂ O ₃ plays a role in connecting broken networks, which can make the network structure dense and improve the glass strength, but the Al-O bond energy is weaker than the Si-O bond, which increases free oxygen and increases loss. I order it. The present invention limits the Al ₂ O ₃ content range to 8% to 18%.

CaO belongs to the network outer body, the coordination number of calcium ions is generally 6, its activity in the structure is very small, it generally does not precipitate easily in glass, and its activity is relatively high at high temperatures. Ca ²⁺ has the effect of polarizing the bridge oxygen and weakening the silicon oxygen bond, which can cause CaO to lower the viscosity and shorten the material properties, while at the same time increasing the loss due to free oxygen. The present invention limits the CaO content range to 1% to 6%.

The present invention can also add MgO on the basis of adding SnO ₂ and F ₂ , and MgO can reduce the viscosity of the glass in the glass system, but if the content is too high, the dielectric constant and dielectric loss will increase, so the present invention The invention limits the MgO content range to MgO<2.0.

P ₂ O ₅ always exists in the form of a PO tetrahedron in the glass structure and is a forming body of glass. When used as a glass skeleton, it can not only increase the temperature resistance of glass and increase the temperature resistance of glass, but also shorten the material properties of glass. As a result of testing the expansion softening point temperature of glass using DSC in a technical study, it was found that the softening point temperature of glass increased after the introduction of P compared to before introduction, helping to improve the temperature resistance of subsequent products. . In addition, the single P ₂ O ₅ raw material is easy to absorb moisture and agglomerate during the mixing process, which worsens the uniformity of the mixture and requires high storage conditions. The present invention uses aluminum metaphosphate or condensed aluminum phosphate raw material. By introducing P ₂ O ₅ , P ₂ O ₅ was uniformly dispersed in the mixture, and during the melting process of the mixture, the melting rate of B ₂ O ₃ was fast and it was partially surrounded by uniformly distributed P ₂ O ₅ , reducing the amount of volatilization and gas. Emissions were reduced. However, if too much is introduced, the low-temperature viscosity increases significantly, and if the P content is too high, it is easy to compete for B and free oxygen, causing devitrification of the glass and crystal precipitation. The present invention found that phase separation due to the introduction of high B and P can be effectively suppressed when the Al ₂ O ₃ content is >8, by controlling the ratios of Al ₂ O ₃ , P ₂ O ₅ , and B ₂ O ₃ This lowers the molding temperature of the glass and suppresses crystal precipitation, and the present invention controls the P ₂ O ₅ content range from 0.05% to 5%.

Alkali metal oxides Li ₂ O, K ₂ O, and Na ₂ O can quickly reduce the viscosity characteristics of glass, helping to melt and purify glass, but the combination of alkali metal and oxygen is prone to polarization and significantly increases dielectric loss. It will be done. The present invention lowers the viscosity and is advantageous for melting glass under the premise of ensuring dielectric loss by adding a small amount of Li ₂ O. The present invention strictly controls the contents of K ₂ O and Na ₂ O in the raw materials, and is present in small amounts. There is no need to add impurities in the raw materials, and the present invention limits the range of Li ₂ O to 0.05 to 0.5% and K ₂ O+Na ₂ O≤0.05% to achieve low dielectric loss at a relatively low melting temperature. Ensure that you can obtain

SnO ₂ decomposes at high temperatures to produce O ₂ , which reduces gas partial pressure and helps release bubbles. More importantly, the SnO ₂ +Li ₂ O of the present invention acts as a complex clarifier and receives the interference of the Sn ⁴⁺ external electronic layer to increase the polarization effect of Li ⁺ and effectively improve the beneficial effects of Li ₂ O and form glass. During the fining process, it reduces the surface tension of the glass liquid, efficiently discharges air bubbles, improves glass uniformity, and realizes the zero bubble rate required for low-dielectric glass fiber production. And the melting temperature of the composite material was greatly reduced, reducing the volatilization of B and F. In the present invention, the range of SnO ₂ content is controlled to 0.05 to 0.5% and the weight percentage range of SnO/Li ₂ O is 0.2 to 3.

The F atom has a small radius and is difficult to polarize compared to the O atom, and forms a Si-F bond with Si, partially replacing Si-O and playing a role in breaking the network in the glass network, and the Si-F, BF, and Al- formed in the glass. The strength of the F bond is weaker than that of Si-O, BO, and Al-O bonds, and this dual effect lowers the melting temperature of the glass, lowers the viscosity, and reduces the surface tension of the glass, which helps reduce the difficulty of the glass forming process. do. And the formed Si-F bond was difficult to polarize, reducing dielectric loss. In the present invention, the F ₂ content range is controlled to 0.2% to 1.5%.

In addition, the ratio of the contents of F ₂ and SnO ₂ of the present invention has a great influence on the dielectric loss of glass, and when a small amount of SnO ₂ is introduced, the two cooperate with each other to further reduce the dielectric loss. The effect is evident when the weight percentage ratio of F ₂ /SnO ₂ of the present invention ranges from 1 to 5. According to experiments, if F ₂ or SnO ₂ is added alone or if the range of F ₂ /SnO ₂ is not 1 to 5, all purposes of the present invention cannot be achieved. When F ₂ and SnO ₂ are used together, F ₂ is dispersed around SnO ₂ to form a Sn-F bond and acts together with Si-F, BF, and Al-F to further lower the melting temperature of the glass, lower the viscosity, and increase the viscosity of the glass. Reduces surface tension.

In summary, the present invention not only makes the glass fiber have a relatively low dielectric constant and dielectric loss by adding SnO ₂ and F ₂ at the same time and controlling the ratio of F ₂ /SnO ₂ , but also reduces the viscosity of the glass fiber, making the glass Ensure that the number of bubbles in the fiber is 0.

The present invention can also add P ₂ O ₅ on the basis of adding SnO ₂ and F ₂ , and control the ratio range of P ₂ O ₅ /(F ₂ +SnO ₂ ) to 2 to 5 to produce glass fiber. The dielectric constant and dielectric loss were further reduced.

The interaction between the various components of the present invention allows the resulting glass fiber composition to have low dielectric constant, low dielectric loss, low foam, low viscosity and excellent glass performance.

The present invention will be further explained in combination with the examples below.

Example 1-7

The composition of the low dielectric loss glass fiber compositions in Examples 1-7 is shown in Table 1.

(1) Mix each compound in a certain ratio according to the content of each ingredient, mix evenly, place the mixture in a platinum crucible, melt it at 1550~1600℃, and process (spinning) into a thread shape below 1350℃ to form glass fiber. manufactures.

Modulus strength tests are performed to ensure sufficient strength of the glass and adapt it to the spinning process. Cut the glass into 20*20*15mm (width*length*thickness), make sure the test surface is smooth and flat, and use an ultrasonic thickness gauge. [The actual sound speed unit measured by the thickness gauge is mm/us, so the sound speed value in the following formula (cm/ s) are all measured values * 10 ⁵ , density unit: g/cm ³ , and can be calculated by substituting the necessary data.

Here, V _T =transverse sound speed (cm/s), V _L =longitudinal sound speed (cm/s).

Here, VL = longitudinal sound velocity (cm/s), ρ = density (g/cm 3), V = Poisson's ratio.

(2) To detect dielectric performance, the uniformly mixed composite material is dissolved in a platinum crucible, the sample after dissolution is annealed at 600°C to remove stress, and then cut into Φ50*2mm samples and tested at 10GHz with a network vector analyzer.

Data on various indicators such as lg3.0 temperature, liquidus temperature, △T, dielectric constant, dielectric loss, modulus and number of bubbles of the glass fiber composition are shown in Table 1.

Comparative Example 1-6

The composition of the glass fiber composition in Comparative Examples 1-6 is shown in Table 2.

Data on various indicators such as lg3.0 temperature, liquidus temperature, △T, dielectric constant, dielectric loss, modulus and number of bubbles of the corresponding glass fiber composition are shown in Table 2.

Data table of Example 1-7 Content range Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 SiO ₂ 50~60 55 60 50 56.43 57 56.44 53 B ₂ O ₃ 20~30 22.5 20.8 27.77 24 21.5 25.5 24 Al ₂ O ₃ 8.0~18 13.87 13.83 12 13 11.85 13 16 CaO 1.0~6.0 3.5 2.1 5 4.1 5 4.1 4 MgO <2.0 0 0 0 0 One 0 1.22 P ₂ O ₅ 0.05~5.0 4 2 4.1 1.5 2.5 0 0 F ₂ 0.2~1.5 0.8 0.6 0.6 0.4 0.8 0.4 1.2 SnO ₂ 0.05~0.5 0.2 0.35 0.3 0.15 0.2 0.15 0.25 Li ₂ O 0.05~0.5 0.1 0.3 0.2 0.4 0.15 0.4 0.3 K ₂ O + Na ₂ O ≤0.05 0.03 0.02 0.03 0.02 0 0.01 0.03 _F2 / _SnO2 1.0~5.0 4.00 1.71 2.00 2.67 4.00 2.67 4.80 P ₂ O ₅ /(F ₂ +SnO ₂ ) 2~5 4.00 2.11 4.56 2.73 2.50 0.00 0.00 SnO ₂ /Li ₂ O 0.2~3 2.00 1.17 1.50 0.38 1.33 0.38 0.83 Lg3.0/℃ 1310 1335 1320 1316 1308 1305 1300 Liquidus temperature/℃ 1050 1123 1060 1080 1023 998 1010 △T/℃ 260 212 260 236 285 307 290 10 GHz dielectric constant 4.1 4.07 4.15 4.12 4.15 4.18 4.16 10 GHz dielectric loss 0.0015 0.0013 0.0013 0.0016 0.0016 0.0018 0.0017 Modulus/GPa 60 65 60 60 62 59 63 Number of bubbles (unit/10g) 0 0 0 0 0 0 0

Data table of Comparative Example 1-6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 SiO ₂ 55 55 60 60 55 55 B ₂ O ₃ 22.2 22.5 20.8 20.8 22.5 22.5 Al ₂ O ₃ 13.87 14.07 14.08 14.33 14.67 14.87 CaO 3.5 3.5 2.1 2.1 3.5 3.5 MgO 0 0 0 0 0 0 P ₂ O ₅ 4 4 2 1.5 4 4 F ₂ 0.8 0.8 0.6 0.6 0 0 SnO ₂ 0.5 0 0.1 0.35 0.2 0 Li ₂ O 0.1 0.1 0.3 0.3 0.1 0.1 K ₂ O + Na ₂ O 0.03 0.03 0.02 0.02 0.03 0.03 _F2 / _SnO2 1.60 0.00 6.00 1.71 0 0 P ₂ O ₅ /(F ₂ +SnO ₂ ) 3.08 5.00 2.86 1.58 20 0 SnO ₂ /Li ₂ O 5.00 0.00 0.33 1.17 2 0 Lg3.0/℃ 1360 1375 1365 1392 1384 1398 Liquidus temperature/℃ 1079 1100 1110 1200 1153 1164 △T/℃ 281 275 255 192 231 234 10 GHz dielectric constant 4.55 4.52 4.55 4.58 4.59 4.65 10 GHz dielectric loss 0.0035 0.0033 0.0028 0.0030 0.0029 0.0031 Modulus/GPa 54 55 58 60 52 51 Number of bubbles (unit/10g) 10 22 25 12 20 30

In the table, lg3.0 refers to the temperature when the viscosity of the glass liquid is 1000Poise, the forming temperature of the glass is the spinning temperature, the liquidus temperature is the upper limit of the crystal precipitation temperature or phase separation temperature, and the upper limit is the upper limit of the devitrification of the glass. It is a temperature, and the larger the difference between the molding temperature and the liquidus temperature, the more advantageous it is for spinning.

As a result of analyzing the data in Table 1-2, the ratio of SnO ₂ /Li ₂ O in Comparative Example 1 was 5.00 and did not fall within the range of 0.2 to 3, and the ratio of F ₂ /SnO ₂ in Comparative Example 3 was 6.00 and 1 It does not fall within the range of ~5, and the ratio of P ₂ O ₅ /(F ₂ +SnO ₂ ) in Comparative Example 4 is 1.58 and does not fall within the range of 2 to 5. As a result, the viscosity of the glass fiber increased and the number of bubbles in the glass fiber also increased to various degrees.

As can be seen by comparing Example 1 with Comparative Examples 2, 5, and 6, compared to Example 1 of the present invention, SnO ₂ was not added in Comparative Example 2, and F ₂ was not added in Comparative Example 5, In Comparative Example 6, SnO ₂ and F ₂ were not added, and both increased the viscosity of the glass fiber and increased the number of bubbles in the glass fiber. The present invention not only makes glass fibers have a relatively low dielectric constant and dielectric loss by adding SnO ₂ and F ₂ at the same time and controlling the ratio of SnO ₂ /F ₂ , but also reduces the viscosity of the glass fibers to increase the number of bubbles in the glass fibers. Let it be 0. In addition, the present invention further reduced the dielectric constant and dielectric loss of glass fiber by adding P ₂ O ₅ and controlling the ratio range of P ₂ O ₅ /(F ₂ +SnO ₂ ) to 2 to 5.

Claims (4)

In a low dielectric loss glass fiber composition,
Based on mass percentage, the content of each component is SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18%, CaO: 1-6%, F ₂ : 0.2 ~1.50%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%, the mass percentage content of SnO ₂ and Li ₂ O is SnO ₂ /Li ₂ O The range satisfying is 0.2 to 3, and the mass percentage content of F ₂ and SnO ₂ is in the range satisfying F ₂ /SnO ₂ is 1 to 5. A glass fiber composition of low dielectric loss.
In a low dielectric loss glass fiber composition,
Based on mass percentage, the content of each component is SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18%, CaO: 1-6%, F ₂ : 0.2 ~1.50%, P ₂ O ₅ : 0.05~5%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%, mass of SnO ₂ and Li ₂ O The range in which the percentage content satisfies SnO ₂ /Li ₂ O is 0.2 to 3, the range in which the mass percentage content of F ₂ and SnO ₂ satisfies F ₂ /SnO ₂ is 1 to 5, and P ₂ O ₅ , F A glass fiber composition of low dielectric loss, characterized in that the mass percentage content of ₂ and SnO ₂ satisfies P ₂ O ₅ /(F ₂ +SnO ₂ ) in the range of 2 to 5.
In a low dielectric loss glass fiber composition,
Based on mass percentage, the content of each component is SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18%, CaO: 1-6%, F ₂ : 0.2 ~1.50%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%, 0<MgO<2.0, the mass percentage contents of SnO ₂ and Li ₂ O are SnO A glass fiber composition with low dielectric loss, characterized in that the range satisfying ₂ /Li ₂ O is 0.2 to 3, and the mass percentage content of F ₂ and SnO ₂ is in the range 1 to 5 satisfying F ₂ /SnO ₂ .
In a low dielectric loss glass fiber composition,
Based on mass percentage, the content of each component is SiO ₂ : 50-60%, B ₂ O ₃ : 20-30%, Al ₂ O ₃ : 8-18%, CaO: 1-6%, F ₂ : 0.2 ~1.50%, P ₂ O ₅ : 0.05~5%, SnO ₂ : 0.05~0.5%, Li ₂ O: 0.05~0.5%, K ₂ O+Na ₂ O≤0.05%, 0<MgO<2.0, SnO ₂ The range in which the mass percentage content of Li ₂ O satisfies SnO ₂ /Li ₂ O is 0.2 to 3, and the range in which the mass percentage content of F ₂ and SnO ₂ satisfies F ₂ /SnO ₂ is 1 to 5, P A glass fiber composition with low dielectric loss, characterized in that the mass percentage content of ₂ O ₅ , F ₂ and SnO ₂ satisfies P ₂ O ₅ /(F ₂ +SnO ₂ ) in the range of 2 to 5.